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<pre class="programlisting">//
// server.cpp
// ~~~~~~~~~~
//
// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

#include &lt;ctime&gt;
#include &lt;iostream&gt;
#include &lt;string&gt;
#include &lt;boost/array.hpp&gt;
#include &lt;asio.hpp&gt;

using asio::ip::udp;

std::string make_daytime_string()
{
  using namespace std; // For time_t, time and ctime;
  time_t now = time(0);
  return ctime(&amp;now);
}

int main()
{
  try
  {
    asio::io_context io_context;

    udp::socket socket(io_context, udp::endpoint(udp::v4(), 13));

    for (;;)
    {
      boost::array&lt;char, 1&gt; recv_buf;
      udp::endpoint remote_endpoint;
      asio::error_code error;
      socket.receive_from(asio::buffer(recv_buf), remote_endpoint);

      std::string message = make_daytime_string();

      asio::error_code ignored_error;
      socket.send_to(asio::buffer(message),
          remote_endpoint, 0, ignored_error);
    }
  }
  catch (std::exception&amp; e)
  {
    std::cerr &lt;&lt; e.what() &lt;&lt; std::endl;
  }

  return 0;
}
</pre>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2003-2018 Christopher M. Kohlhoff<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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